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Perovskite-Based Lean-Burn NO x Trap Catalysts Without Using Platinum Group Metals: K/LaCoO3/Ce1−x Zr x O2

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Abstract

A series of Ce1−x Zr x O2 (x = 0, 0.1, 0.2, 0.3) solid solution supported lean-burn NO x trap (LNT) catalysts K/LaCoO3/Ce1−x Zr x O2 were prepared by successive impregnation. After sulfation the supported perovsikte LaCoO3 was well maintained; reducing treatment partly destroyed the perovsikte, but it can be well recovered by re-oxidation treatment. Based on NO x storage and sulfur-resisting performance of the catalysts, the optimal atomic ratio of Zr in Ce1−x Zr x O2 support is x = 0.2. The catalyst K/LaCoO3/Ce0.8Zr0.2O2 exhibits much better NO x storage capacity than the Pt-based catalyst Pt/K/Ce0.8Zr0.2O2, which is highly related to its stronger capability for NO to NO2 oxidation. During NO x storage much larger amounts of nitrate and nitrite species were identified by in situ DRIFTS over perovskite-based catalysts than over Pt-based one. The H2-TPR results reveal that after deep sulfation little sulfur species were deposited on the catalyst K/LaCoO3/Ce1−x Zr x O2, showing strong sulfur-resisting ability. As a result, it is thought that the full replacement of Pt by perovskite LaCoO3 in the corresponding LNT catalysts is feasible.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (No. 20876110, 21076146), the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20090032110013) and the Program of New Century Excellent Talents in University of China (No. NCET-07-0599).

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Authors and Affiliations

  1. Tianjin Key Laboratory of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People’s Republic of China

    Xiaoxia He, Junjun He & Ming Meng

  2. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Sino-Platinum Metals Catalyst Co., LTD, Kunming, 650106, Yunnan, People’s Republic of China

    Junjun He

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  1. Xiaoxia He
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  2. Junjun He
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  3. Ming Meng
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Correspondence to Ming Meng.

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He, X., He, J. & Meng, M. Perovskite-Based Lean-Burn NO x Trap Catalysts Without Using Platinum Group Metals: K/LaCoO3/Ce1−x Zr x O2 . Catal Lett 141, 1364–1370 (2011). https://doi.org/10.1007/s10562-011-0664-5

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